一起由两种罕见血清型副溶血性弧菌引起食物中毒事件分析

Objective To analyze the etiology of a food poisoning caused by mixed infection with two rare serotypes of Vibrio parahaemolyticus, and we provide the basis for the pathogen examination of food poisoning. Methods According to Food Microbiology Testing for Vibrio parahaemolyticus (GB 4789.7-2013) and other standards, 9 patients with food poisoning treated in Longmen County People's Hospital were selected as research objects, and their rectal swabs were collected for analy⁃ sis and identification. Results There were a total of 9 patients with clinical symptoms, including 2 patients aged ≤20 years old, 1 patient aged 21-<40 years old, 4 patients aged 41-<60 years old, and 2 patients aged ≥60 years old. Eight strains of Vibrio parahaemolyticus were detected in 9 rectal swabs, with ratios of the blood classification type O2:K28 was 25.00% (2/8), and O8:K21 was:75.00%(6/8); The similarity of O2∶K28 serotypes (VP18171 and VP18175) was 66.7% by PFGE molecular typing. The similarity of O8∶K21 serotype (VP18172, VP18173, VP18176) was 100.0%, and the similarity of O8∶K21 serotype (VP18177, VP18174, VP18170) was 88.4%-95.2%. The results of the drug sensitivity test showed that while 1 strain was resis⁃ tant to ampicillin and cefazolin, 1 strain was resistant to ampicillin and 3 strains were resistant to cefazolin, the other strains were sensitive to all of the tested drugs, and there was no multi-drug resistance. Conclusion The food poisoning was caused by mixed infection of two different serotypes O2∶K28 and O8∶K21 of Vibrio parahaemolyticus. © 2020 Editorial Office of Chinese Journal of Schistosomiasis Control

Etiological analysis of a case of food poisoning caused by mixed infection with two rare serotypes of Vibrio parahaemolyticus

Objective To analyze the etiology of a food poisoning caused by mixed infection with two rare serotypes of Vibrio parahaemolyticus,and we provide the basis for the pathogen examination of food poisoning.Methods According to Food Microbiology Testing for Vibrio parahaemolyticus(GB 4789.7-2013)and other standards,9 patients with food poisoning treated in Longmen County People's Hospital were selected as research objects,and their rectal swabs were collected for analysis and identification.Results There were a total of 9 patients with clinical symptoms,including 2 patients aged ≤20 years old,1 patient aged 21-<40 years old ,4 patients aged 41-<60 years old ,and 2 patients aged ≥60 years old.Eight strains of Vibrio parahaemolyticus were detected in 9 rectal swabs,with ratios of the blood classification type O2:K28 was 25.00%(2/8),and O8:K21 was:75.00%(6/8);The similarity of O2∶K28 serotypes(VP18171 and VP18175)was 66.7% by PFGE molecular typing.The similarity of O8∶K21 serotype(VP18172,VP18173,VP18176)was 100.0%,and the similarity of O8∶K21 serotype(VP18177,VP18174,VP18170)was 88.4%-95.2%.The results of the drug sensitivity test showed that while 1 strain was resistant to ampicillin and cefazolin,1 strain was resistant to ampicillin and 3 strains were resistant to cefazolin,the other strains were sensitive to all of the tested drugs,and there was no multi-drug resistance.Conclusions The food poisoning was caused by mixed infection of two different serotypes O2∶K28 and O8∶K21 of Vibrio parahaemolyticus.